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Re:The Nvidia DGX-1 Deep Learning Supercomputer in a Box by pinewurst on Tuesday April 05, 2016 @06:39PM (#11435154)
The diagram is confusing, but the GPUs are connected to the NVLink matrix which is connected to the motherboard via the PLX PCIe switches. The quad IB/dual 10GbE are separate IO attached to the motherboard.

https://devblogs.nvidia.com/parallelforall/inside-pascal/

Re:The Nvidia DGX-1 Deep Learning Supercomputer in a Box by virtuallynathan on Tuesday April 05, 2016 @10:19PM (#11436138)
That would make much more sense. Thanks! The PCI bandwidth must be fairly limited. 4x 100G Infiniband is 64x PCIe lanes, out of 80x lanes available.